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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fe9f185df3a3235c981dd00fa34b554c7a2e32c5e987b55aacae8b1c2ac719d' 
  AND token = 'H4DtZIz7BvZQrBL4E09hj6B6PV+DoT7pcosDUEhuV5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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