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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4563f993bcac46a343d698908e5c1dd3618779915b31b2e9f57f690a29fb8ef1' 
  AND token = 'WaeZzbMV5tMdvxhH7u8YWXYSiW3gEMsLoX0C0ZgVRgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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