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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '377dc7f1f99aefa1da5e6c4e9b25b412e42255bae6113aec0a768ac27dcad7bb' 
  AND token = 'q6Lps8vjyc8TnZQVvv8db2Jvsppjgdcr9yQm89J4ik8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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