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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39d95dff2dc2f57ae09908617121aeccacafde968aad1576762d15dfe602b104' 
  AND token = 'E4e/u0EqQ3SZpf8IdcPm5T0UZ/nA0c5084VNZeEATRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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