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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7ce063b45bca2b1e69a2f6d3897b284a742271e1110ced6550ab62611401704' 
  AND token = 'uG6op6qV8QUQ12Fc+Ys7S9K/LZemSl9LLucIlxGQ4BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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