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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '960236b6f2d5ff1b27a1c0f6122e2e7c973110a189ec0f83f73dd3a2642582ca' 
  AND token = '2o6PcF/Sb/aHPlwp585Z4WSPJ1NdurjS+Nav8cbtJxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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