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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfd45638db81f360770f3a6e383d99fae48ac9f86648cc7397410d99c5cd5590' 
  AND token = '9dmPvQmyaZr9jaNZuwIiaoNY4eXyQZWLKBtG41vNb6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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