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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8065b1ff0a7f92dfdcf01d46783ca9dd9548229c2371fb3de48b5abcfdef44c' 
  AND token = 'NuCw4Pnw8yN1ZEc1C0UU+v+aqHH1vxy7yurVh6InTWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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