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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eb847ce5f4b6a8f0ffc28193908bd7e496fe409bb6e25ae19a0569ae2509d59' 
  AND token = 'wouB6MTQZ0pGaKYfgBIqJEi5UUttuMk2o8ibLZiaRKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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