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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1bca2c470bf589d1db7083dc56e8547a9da1583d4cc2e419909c5b699288546' 
  AND token = '8TVckxgZHXReSxyJlyPQ/EKMsbLoLpa8qgutCTngbAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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