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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '679320d708ac71aa7a63bc989e8e524e66a3e712d8b88ff30fb28ec568f3aca0' 
  AND token = 'OLQhD7kWiN3S3ilFEcGRODTR6FO8ipsD25qkU5fScNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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