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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '833d870d4dc77d41ce8a94b5c52aded2688d4468fed99f70dbece3218419ce76' 
  AND token = 'TLlOdrAQGFvChQmJ28nuBqsi86uASTiaGsX/8KwxgRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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