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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf347f9129a6da5d49e33f122b34ccf74833d39257885a45d824500563a2dbaa' 
  AND token = 'YrWWuSwWc0top3NHZFwCamuOcMrYXMy7tepybyn1XTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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