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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5efa1a9784e1d8cdd1806f3efb5e6b1144f790c285ca4841b1e664961886cec1' 
  AND token = 'tpUBU0fmR4+rnmycB+dnd2bO4ysyN/+ViDRLIjO2ZDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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