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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bad8b9d3495f0e47cab38f34c86fd4210b63e553d8d8a9917304b04b6a3c961e' 
  AND token = 'lcaLc494q0sA2FpgIH0hZAin9JZSVwn9kwE4paB8Lbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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