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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2bb26a84137ddfb971ae0c1bea13784bf3be8cf8c3926395da1ed206107e1a5' 
  AND token = 'qQyXp5Oruk2L66TVJuE885+e6fyCIEoWCVTN8wsY1z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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