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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08f08da2ea5fa4e9731edd8e511e47252f4121e9186b319a4e8b20a43bd5aec5' 
  AND token = 'tZAK3C4JRL6fkIeOJFWH8F3sNPqgo6zKz3li2ceBK6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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