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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136b199e39aba5cd5a4609e6538a1f32b17d50f60e2cbb65ce6d061dc7aea557' 
  AND token = 'KD/QGkhmwLFcBWH/pGaBhN3k9XaTVwizPd9AFwb7g2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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