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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8ee6f529a2edb6859444250c5e3ccdf1c0462afbec76780444c196253786432' 
  AND token = '51Uo933ccE/jXQk8T5essMeXxyh7u/ZVRdo6roQljLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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