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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84b3a236721a0269f818d4cef2e1423bda6caebb637fc1da3db50f91db703c53' 
  AND token = 'ejojVNQLTsdmQpQXu7dJ90KzUHy98kJvLC5tVp3mBpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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