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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45571100cb23e64e5868e8603e37bb38bccab44e7749165c0dffd643d931cdb3' 
  AND token = '00j1M/kYICJ0e2J5yoY2q0b+uSh1EEh0x73+25Kw+hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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