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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd67a3003e8500bf421240e9ea5f2cc4fe70965ee9ed84d8c60c7fc0b18753843' 
  AND token = 'dqHYf9w1Wn49FZjbRJL+2cY2blfs0lhLt1mtRj3pHyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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