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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16a752c9549291b91538a12c85957762053f2742112f7652218d0fdbff1da0f5' 
  AND token = 'Ae1QlXYxY1Ii3woGrhPiriRFwm0yiI8+ul4Oie8YjVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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