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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf40f8cdd966978f039456652933563a3a3df3045ddaf44af70e4caee7b05023' 
  AND token = 'JS4QHaDLfOydz1DVvs8W9Dk6uJZbJuoOomsMm4hJCys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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