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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '882cbbd4771d9cf0cedab8ae8ea3c894989e96bcc89fb32557d8a4b29c3483d2' 
  AND token = 'uJa4RkcJi9yR6k7ph9mN23GmB1vQ8HtjZqwmvKbF+qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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