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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62fdc461977ab279682d1f2b7e4a636e0f769d966e5669fe834d0a8c86fd4285' 
  AND token = 'Rk/F6WagysSrKUBNo1z7lvbttcupuBGdSBymScSNpno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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