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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87d714ead5edb593802d70a718e77f29afb71ae09917a1669ad16d44422cb05a' 
  AND token = 'SBnuEe4D43jhZbKzytx3hCZEdMa9ptInf4QKlaRfyz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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