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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ad1349fe3291864435023f262ec3248fa0ffa2c4323ba3b9ea8871a9ccee4f4' 
  AND token = 'rQJjb4A0OqoZAbW+TYlJdMrZuVWkWCH3xDNtGixGW8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}