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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f2d575dd2be62e3e7f822b78bdfe718d67d7c8ec25e7155c53abd2fb44a504b' 
  AND token = 'CyUl1Lw2537QZ4VSVy71kqbfR9fxr4QefwUwcsmthOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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