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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59a3735df63dbf28b7b181bf38c2b51d6c1f5329b486aa28543ff4d9d2e959cd' 
  AND token = 'H6uX2k/w43o6D17BqIu+fiNMG0ntEl6q4qQE2ACsehU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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