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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '375f576b4903545db4e116493efce4db197fd5a06858825455a740a4245f76d9' 
  AND token = '8bxNz5wEtYEfW1uM3DVl25UpxSoh9ezW5HllT5nqhBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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