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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1e620aedb0887cf8b33a0e5f47638743ee84bc3e2742aaebcbf059448445d06' 
  AND token = 'MwP5CN5jYMxsAHNGUr2y7XRdbfj29oQmSvBYXS24u7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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