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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ceb9003105e7d74fd9b163451c23dc2d3d54baed38c1763f743f94f553a35c4' 
  AND token = 'PYa9jV5hLY654zCoc1YK5HtfmmJhbYsaYnG5YY5rkUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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