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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd22444eef6742ad5d024c33e1ff0b245e700eb1d41e25636bac168b034a97910' 
  AND token = '5o/V3R/KZuSrb1weE71h/jw2ZSAm/naaglCxDtsN1gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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