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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb8ea6a5682f2a7bb5870968dcdfa06c6c0bc3ba626524699b3a66a507daedb4' 
  AND token = 'fIU/gfgV34dGGIc0uvYg07f4EmMGuyRcZLH7Axd27ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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