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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c9a04093fb0eb45e907280acb1948b3c67d941b2cd75c2ab5365dc0a5aa6ef9' 
  AND token = 'K7ULpZOR/DN2TEBokSSNoL/zkd6gPRgKJWO9I8G1DKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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