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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f24783a20b388869234b4b091ff55b2cb2af7026b4d9b3ad241bacbd4fd8152f' 
  AND token = '2TzTU5F37eIHYu5EEJYNxvIqeHO47Wxe+TvjzsBE8ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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