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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6982a189638a22d381a37bee53966987eadacb0a45e50cb28d21594df9ce24da' 
  AND token = 'sprwb6ejJSERTVr4le7hCjzY7AhWILzTT3KNsLlDaQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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