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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f90ef515adc2f66d6271750d82520b87a5d7b75467b6eea216aa1f62d864485b' 
  AND token = '6/Ldc2otX303FkTmAOH78a7T/BDY3U8MuJUwg24t/X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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