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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae28dbfc8c168406faccae2cd863b69afbf2d67355d6028c8f101d55b51afaa' 
  AND token = 'Stgdc6PNSQYXx6gApozbD6zuMQVLkZeSp14cD2ExCx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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