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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e54055332337cefb64e74e8cc79a9ce675e903a3f42da54aff35fa74111d6eb' 
  AND token = 'p85vNesRkXSDKNpI5Q63FQOWOEJ/p6hZWHQ8pejheX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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