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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb2c062b48e0f4a289ea31ccddc0b159680e087688ce5b8656701084e7382e15' 
  AND token = 'da3xpc3xVce+BJagx30EPmTgpGAaL2KN15anjMq+y/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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