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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94101470aeb977dfaf68e49f060897d1067c9dfe9bad8abd44b5cab47667afdf' 
  AND token = 'i644/OA+FUapWdkrCWvvQkFtcjj2vNQhLg4eoh7+NOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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