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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f7a1d0bcb697e97bc662fb3cb0bf141cf98fadf7a3cf495295f379ecf7271e5' 
  AND token = 'HxWbXz69bYrBsDzzQtpvsDPUptKxmYEv6ULJMRJ/OXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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