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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a72c79ed55bb13a9aab79c9a114397d4aae590301199b4cb29d575ebfe4e1e9b' 
  AND token = 'FsVgCmH00PdFiR6kTeVTd/iJXSTlYMaMWS3eLU7ITt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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