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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e3ccd6de5f748a9c18a0e53775c400833dce37887c387881cbbe8e123d1952' 
  AND token = '0ppXmucRd4e8UUAI0qCyWWS9JzRhXdWYc00hccig7Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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