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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4c66532ba6ec58dd6a83372f4a2e5637f1e8a04239ba16bb995d3f87275ee6e' 
  AND token = '9rDQkY1qTq/9HnwNPmE+JdqNryTFL63X2VzXN0qwXsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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