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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1579eaaf355be94ca43448e85f0071f8d69e82d4543a063c8eca90585727a97' 
  AND token = 'SSPgNean8PwcanhtXBm6+FSLNjs4HuI+EFNR9Mn+Nno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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