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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd3a940d871f634e646e29a718693c4fe80df7ac3c31933cd53e6a597343e1e' 
  AND token = 'Pt9gh87w7RTTh5MF0lgZten1Iqdi6p/M9M4P2zqju60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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