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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79e863e568163a46427d86325ffc845c307fcde43371411e3dd0887245d8f22a' 
  AND token = 'hkH3Ky4T1yvqsQKvLz51em5K9hHJLamaKVGr60Cs7Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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