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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62d450945391e29b5ca40a501eccf2bf980e3ed623dc98c4dd5a32f0c6484d2' 
  AND token = 'Px+aqo4y2zqHzotx3PIV9MkKw7WK5igldF65FX21JQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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