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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4e0c7d0df3a859e12597b8908c2008f776a5a69628deac951ca7123ed985c93' 
  AND token = 'gX5orvcBsiNGIisorljpcHZpARbIKUW21T4JskzjBjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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