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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3917818799cacaf73a940fafc2d364ba222039c4460ce45744ea49ff7824b574' 
  AND token = 't7ktBCJvnhAk8J0F+efCtoOPvFrnUrgceuE+W3gZUss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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