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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf3a6825ea3a2cfbcdf9aff6b6b448064c4f9b47323d55e2692c7b7c267dcbb1' 
  AND token = 'FBnIH0AI5F2fXlHBMa7emV/7yBxU2SaKomjr0fEti6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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