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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8754d9ca28da96c3415a91135efd7a58fe7a731233e372e6085986b05d1591cc' 
  AND token = 'ojCT5UfEIs6JRl7DX9tPoS5DsAok4p2utQ6d7CMgvug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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