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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28deedc136101cc60313ad699a5d26ebc210717c6b63f80da52cf7c54215ad4' 
  AND token = '1hsp75jGVHjevlRoSejJuTCbW03KXFHU+M/iaXSRhmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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