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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a2366da440d8adb720950483dbd3e6ffc2e9defd8d82c037550559061b717d6' 
  AND token = 'S0RQkxCmrYFDbeOZdqFrS+h3UimPcrX1r1oJqjhEoAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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