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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e91ddb6dc498603b05dea8bf23f3ed84d0c3c775795c358315755b77742a16b0' 
  AND token = 'QAHxN0cQdnqJKiQDdwrPzFQw6Pe0V0Cjq8l0M45prd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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