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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1a1f60ba7430f19531d2b776aff5ef41d166f5067bb4a5e8bba39fb4c50a2e8' 
  AND token = 'b0o1nNZUH/SF0tNNTH2ieYhaINhl40hFXmlUTZC7okE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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