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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a850c7e61b23840ce69e6873d0c76a3874a8fedeb9ebb78570e616b390136cd' 
  AND token = 'Nil600zMFVGUL7wH8j7KwM5TD1m7/sH2NxzRcncZlQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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