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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6dc9764d464ac0a0719ea97a051162425cfc447046b1330293aed9631fb4a30' 
  AND token = 'AhvCWFSrhuR17fGgti2NC8otChSP86aqgff8M4gcN+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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