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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789c283632459f593ba3a0a03630129dff75b4cdd18b3ff04b7b6aa6e4f71b03' 
  AND token = 'WjxAd8jvXbdjv4lr6gtwcFlDvsw6aaBTjW9Fld7/GBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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