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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5710a873de1f38d227e6bbde38ee6e88a557b22ea599f9b11f2cf23be767d2ff' 
  AND token = 'xykLWeoc/AH4KEWff3OwoZdy6LS6PK+ob9bo3Gg1Lhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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