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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e25fad447a5519e8926e97ea5611d85124ae9fa3fdf366a6c0a4025dc7bd2eb' 
  AND token = 'UXyCo+HcQc1iiO/kt2lWJi7xxO3xEy1elR8KUs6frWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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