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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa38601d35264952f3dc826a21d998631a2aeb9233b4ee6940801a7415b7ca37' 
  AND token = 'cx9U0oKh0Kozv7UcGcUMHxR10P+Lf2yilhimRBkv8D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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