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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cae8a89a9ca98beef20d0d8f5ee831a8a16f51bf39f1850cf43581b11080cdf' 
  AND token = 'o56wmbSIhK+qTt00r7KX9+ymq9bdgJICp0IYjQME5bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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