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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53ec8fec4817e95373f9a22cd67176c33cb349f6d013b8a67863eaab26944aad' 
  AND token = 'JnsJp1lSK7JbygqcHOAwl9ZJfHwIgxJ7l3xgFnKFKXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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